EP0781382A1 - Countersunk head screw - Google Patents

Countersunk head screw

Info

Publication number
EP0781382A1
EP0781382A1 EP96917402A EP96917402A EP0781382A1 EP 0781382 A1 EP0781382 A1 EP 0781382A1 EP 96917402 A EP96917402 A EP 96917402A EP 96917402 A EP96917402 A EP 96917402A EP 0781382 A1 EP0781382 A1 EP 0781382A1
Authority
EP
European Patent Office
Prior art keywords
ribs
screw
countersunk
screw according
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96917402A
Other languages
German (de)
French (fr)
Other versions
EP0781382B1 (en
Inventor
Gottfried König
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ejot Verbindungstechnik GmbH and Co KG
Original Assignee
Ejot Verbindungstechnik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ejot Verbindungstechnik GmbH and Co KG filed Critical Ejot Verbindungstechnik GmbH and Co KG
Publication of EP0781382A1 publication Critical patent/EP0781382A1/en
Application granted granted Critical
Publication of EP0781382B1 publication Critical patent/EP0781382B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F16B35/065—Specially-shaped heads with self-countersink-cutting means

Definitions

  • the invention relates to a countersunk screw with an even number of ribs with countersunk blades arranged on the conical underside of their screw head and projecting from the underside.
  • Such a countersunk screw is able to cut the countersink for the countersunk head of the screw by means of its ribs in a workpiece.
  • Such countersunk screws are known for example from DE-GBM 92 02 650 and DE-OS 33 34 212. Both countersunk screws have in common that they have an even number of mutually identical, radially extending ribs, it being important according to the former of the publication to provide a larger number of ribs, namely more than 8. This is intended to enable a good distribution of the screwing forces to the countersunk edges formed by the ribs. The latter publication is to give the ribs a milling cutter design. With both countersunk screws, all the ribs extend from the outer edge of the screw head to the screw shaft.
  • Countersunk screws of this type are mass-produced products that are manufactured with tools that must have a long service life.
  • the cold forming of the underside of the screw head is carried out by an embossing process.
  • the design of the underside of the screw head must take this into account, since the embossing tool forms the negative image of the underside of the screw head and accordingly speaking must be formed with ridges and depressions, which then cause the flow of the material of the screw head during cold forming and are exposed to high loads.
  • the invention is based on the object of designing the countersunk screw with regard to the conical underside of its screw head in such a way that the ribs have a design which achieves a good machining of the workpiece to be fastened and a favorable discharge of the chips and which has a robust, stable shape for the Allow embossing tool. According to the invention, this is done in that the ribs are present in an even number, of which every second rib has a shoulder at its end facing the screw shaft, which is formed by shortening the rib in question relative to the adjacent ribs.
  • a rib design results, in which a space is formed between two unshortened ribs and these are formed by the heel of the shortened rib and is relatively large in the area where the ends of the screw shaft facing the screw shaft Ribs converge so that the ends of the ribs would come very close together if not every other rib were shortened.
  • a correspondingly large projection of the embossing tool can protrude into this relatively large free space, that is to say the embossing tool does not have any particularly narrow projections which tend to break away under prolonged loading.
  • the rib design according to the invention not only facilitates the shaping of the embossing tool, which ensures a long service life, it also leads to the fact that chips can accumulate in the free spaces when the countersunk screw is screwed into a workpiece, which would otherwise have to flow or could exert an undesirable pressure on the material of the workpiece due to their volume.
  • the length of the rib in question adjoining the shoulder is expediently chosen so that this length corresponds to approximately 2/3 of the length of the adjacent ribs.
  • the shortened rib above all, can fully participate in the machining of the material of the workpiece in its outer area when the countersunk screw is screwed in, and can remove the material machined in this area with the chips migrating from the inside, while in the radially inner area the material machined there can largely remain in the above-mentioned free spaces, so that a significantly smaller volume of chips has to be requested in this area.
  • the countersunk screw discussed here is often used to screw a plate forming the workpiece to any support. If the plate is thicker than the screw head of the countersunk screw, then it is expedient to extend the uncut ribs to the area of the screw shaft so that they extend into the end of the screw shaft, that is to say also in the area of the screw shaft create a cutting of the material in the sense of widening the through hole for the screw. If, on the other hand, the plate is only as thick or thinner than the screw head, it is sufficient if the uncut ribs with their end facing away from the screw head merge into its conical underside or end in the transition from the screw shaft and conical underside.
  • the screw head carries out machining in the workpiece, which takes up the entire screw head, the end of the screw shaft which is attached to the screw head then protruding directly from the plate and passing into the carrier for the plate.
  • machining in the workpiece
  • the end of the screw shaft which is attached to the screw head then protruding directly from the plate and passing into the carrier for the plate.
  • the ribs form a concave cutting edge in the direction of insertion.
  • the ribs can also be made from two straight parts that are connected by a bend.
  • the ribs are given a concave shape in the direction of screw rotation. If the above-mentioned parallel staggered ribs are used, they can be staggered against the direction of rotation, so that the shavings are conveyed radially inward from the ribs.
  • the outer surfaces of the ribs can be designed accordingly. These can be made to run in a straight line, less material being machined than if the outer surfaces of the ribs are to be curved. In this case there is increased machining. If it is desired to give the screw head a larger depression compared to the relevant outer surface of the workpiece, the screw head can be provided with a substantial cylindrical edge which continues over the relevant ends of the ribs. In this case, a cylindrical run-out of the conical countersink is cut from the ends of the ribs, into which the screw head can lower and thus possibly lie with its outer surface deeper than the surface of the corresponding workpiece.
  • FIG. 3 is a side view of a countersunk screw with ends of the ribs merging into the conical underside of the screw head
  • FIG. 4 shows a side view of a countersunk screw with ribs extending into the end of the screw shaft
  • FIG. 5 is a side view of the countersunk screw with ribs elongated parallel to the screw shaft
  • FIG. 6 shows a section similar to that according to FIG. 2 with offset ribs
  • FIG. 7 shows a section similar to that according to FIG. 2 with curved ribs
  • FIG. 8 shows a section similar to that of Figure 2 with bent ribs.
  • FIG. 1 shows the side view of a countersunk screw with the screw head 1, to which the screw shaft 2 with the thread 3 connects.
  • the screw head 1 has a conical underside with the cone 4 adjoining the screw shaft 2 and the subsequent cone 5, the latter merging into the cylindrical edge 6 on the top side 7 of the screw head.
  • the ribs 8 and 9 are made of the material of the screw head 1 Cold stamped out.
  • the ribs 8 extend from the edge 6 to the edge 10 at which the cone 4 abuts the screw shaft 2.
  • the shorter ribs 9 end on their side facing the screw shaft 2 in the shoulder 11, by which the length of the ribs 9 is limited. Due to the presence of this paragraph 11 there is a free space 12 between the two adjacent ribs 8 (see also FIG. 2), which has a favorable effect on the design of the shaping tool which shapes the screw head 1, since this forms the negative image of the underside of the screw head 1.
  • projections are to be provided on the molding tool for forming the interstices between the ribs 8 and 9, of which the projections of the molding tool which are present laterally next to a shorter rib 9 are each connected via a bridge in the molding tool which fills the free space 12 . This gives the molding tool a high level of stability and therefore a correspondingly long service life.
  • the length of the shorter ribs 9 corresponds to approximately 2/3 of the length of the adjacent longer ribs 8. It should also be pointed out that, as FIG. 1 shows, the screw head 1 is provided with the slot 13 for a screwdriver with a blade. Instead of the contactor 13 can naturally any other tool holder can also be used, for example a cross recess.
  • Figure 2 shows a section along the line A-B in Figure 1, it thus shows the underside of the screw head 1 with the symmetrically arranged shorter ribs 9 and the longer ribs 8, which are each offset by the same angle to each other.
  • the longer ribs 8 extend from the edge 6 to the edge 10 at which the cone 4 merges into the screw shaft 2.
  • the shorter ribs 9 end on their side facing the screw shank 2 in the shoulders 11, which here, as also shown in FIG. 1, run slightly chamfered in order to facilitate the flow of the material of the screw head 1 during cold forming.
  • FIG. 3 shows the side view of a countersunk screw with a screw head 1, the unabridged ribs 15 of which at its end facing the screw shaft 2 merge into the underside of the screw head 1, which is formed here by the single cone 17. It is therefore an embodiment in which the countersunk - 8th -
  • the screw the screw head with the countersunk cutting edges 18 does not come into contact with the workpiece in question until the cone 17 has pressed a short distance into the material of the workpiece in question. This is advantageous if the workpiece in question in which the screw head is to be countersunk consists of a relatively thin plate.
  • FIG. 4 shows a further embodiment of a countersunk screw in a side view, in which the outer surfaces with their countersunk cutting edges 21 of the ribs 19 and 20 are curved outwards.
  • FIG. 5 shows a modification of the design according to FIG. 4, in which the end 23 covering the screw shank 2 runs parallel to the screw shank 2, that is to say in the region of the end 23 a cylindrical bore is cut out of the material of the workpiece in question Diameter corresponds approximately to the diameter of the thread 3, so that there is a through hole for the thread 3 in the workpiece in question.
  • the cylindrical edge 6 of the screw head 1 is at the same time the boundary 24 for the relevant ends of the ribs 8 and 9. These ends, with their boundaries 24, lie in a cylindrical envelope which corresponds to the cylinder forming the edge 6.
  • FIG. 6 shows a screw head 1 similar to that shown in FIG. 2, in which uncut ribs 25 and shortened ribs 26 are each offset essentially parallel to a vertical center line 29. Because of this arrangement of the ribs 25 and 26, when the screw head 1 is screwed into a workpiece in the direction of the arrow shown, the tendency for the chips flowing between the ribs is that they are conveyed to the outside.
  • FIG. 7 A similar design is shown in FIG. 7, in which the ribs 27 and 28 with their countersink blades 30 are convex on the basis of the direction of rotation indicated by the direction of the arrow and thus give chips between the ribs 27 and 28 the tendency to slide away to the outside.
  • Figure 8 shows a modification to the design according to Figure 7, in which the ribs 27 and 28 are provided with a kink, which is advantageous for the creation of the mold in question.
  • the ribs 27 and 28 can be made concave according to FIGS. 7 and 8, which has the effect that the chip material cut out by them is compressed inwards, that is to say is not conveyed outwards, which is the case Various applications, particularly when the workpiece material is loose, can be advantageous.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Connection Of Plates (AREA)

Abstract

The invention relates to a countersunk head screw with an even number of ribs with countersinking blades on the underside of the screw head and projecting therefrom. Every other rib has a step at its end towards the screw shaft formed by shortening the rib concerned in relation to the adjacent rib.

Description

Senkkopfschraube Countersunk screw
Die Erfindung bezieht sich auf eine Senkkopfschraube mit an der koni- sehen Unterseite ihres Schraubenkopfes angeordneten, gegenüber der Unterseite vorspringenden, in gerader Anzahl vorhandenen Rippen mit Senkschneiden.The invention relates to a countersunk screw with an even number of ribs with countersunk blades arranged on the conical underside of their screw head and projecting from the underside.
Eine derartige Senkkopfschraube ist in der Lage, mittels ihrer Rippen in einem Werkstück die Senkung für den Senkkopf der Schraube freizu- schneiden. Derartige Senkkopfschrauben sind beispielsweise aus dem DE- GBM 92 02 650 und der DE-OS 33 34 212 bekannt. Beiden Senkkopf¬ schrauben ist gemeinsam, daß sie eine gerade Zahl von untereinander gleichen, radial verlaufenden Rippen aufweisen, wobei es gemäß der ersteren der Druckschrift darauf ankommt, eine größere Zahl von Rip¬ pen, nämlich mehr als 8, vorzusehen. Hierdurch soll eine gute Verteilung der Schraubkräfte auf die von den Rippen gebildeten Senkschneiden ermöglicht werden. Bei der letzteren Druckschrift handelt es sich darum, den Rippen eine Gestaltung nach Art eines Fräsers zu geben. Bei beiden Senkschrauben erstrecken sich sämtliche Rippen vom Aiißenrand des Schraubenkopfes bis zum Schraubenschaft.Such a countersunk screw is able to cut the countersink for the countersunk head of the screw by means of its ribs in a workpiece. Such countersunk screws are known for example from DE-GBM 92 02 650 and DE-OS 33 34 212. Both countersunk screws have in common that they have an even number of mutually identical, radially extending ribs, it being important according to the former of the publication to provide a larger number of ribs, namely more than 8. This is intended to enable a good distribution of the screwing forces to the countersunk edges formed by the ribs. The latter publication is to give the ribs a milling cutter design. With both countersunk screws, all the ribs extend from the outer edge of the screw head to the screw shaft.
Bei derartigen Senkschrauben handelt es sich um ein Massenprodukt, das mit Werkzeugen hergestellt wird, die eine hohe Standzeit aufweisen müssen. Dabei erfolgt die Kaltverformung der Unterseite des Schrauben¬ kopfes durch einen Prägevorgang. Hierauf hat die Gestaltung der Unter¬ seite des Schraubenkopfes Rücksicht zu nehmen, da das Prägewerkzeug das negative Bild der Unterseite des Schraubenkopfes bildet und dement- sprechend mit Erhöhungen und Vertiefungen ausgebildet sein muß, die dann beim Kaltverformen den Fluß des Materials des Schraubenkopfes verursachen und dabei hohen Belastungen ausgesetzt sind.Countersunk screws of this type are mass-produced products that are manufactured with tools that must have a long service life. The cold forming of the underside of the screw head is carried out by an embossing process. The design of the underside of the screw head must take this into account, since the embossing tool forms the negative image of the underside of the screw head and accordingly speaking must be formed with ridges and depressions, which then cause the flow of the material of the screw head during cold forming and are exposed to high loads.
Der Erfindung hegt die Aufgabe zugrunde, die Senkkopfschraube hinsicht¬ lich der konischen Unterseite ihres Schraubenkopfes so zu gestalten, daß bei Erzielung einer guten Zerspanung des zu befestigenden Werkstücks und günstigem Abfluß der Späne die Rippen eine Gestaltung aufweisen, die eine robuste, standfeste Formgebung für das Prägewerkzeug ermögli- chen. Erfindungsgemäß geschieht dies dadurch, daß die Rippen in einer geraden Zahl vorhanden sind, von denen jede zweite Rippe an ihrem dem Schraubenschaft zugewandten Ende einen Absatz aufweist, der durch Kürzung der betreffenden Rippe gegenüber den benachbarten Rippen gebildet ist.The invention is based on the object of designing the countersunk screw with regard to the conical underside of its screw head in such a way that the ribs have a design which achieves a good machining of the workpiece to be fastened and a favorable discharge of the chips and which has a robust, stable shape for the Allow embossing tool. According to the invention, this is done in that the ribs are present in an even number, of which every second rib has a shoulder at its end facing the screw shaft, which is formed by shortening the rib in question relative to the adjacent ribs.
Aufgrund der Kürzung jeweils der zweiten Rippe ergibt sich eine Rip¬ pengestaltung, bei der zwischen zwei unverkürzten Rippen ein von diesen und dem Absatz der verkürzten Rippe gebildeter Freiraum entsteht, der in dem Bereich relativ groß ist, wo die dem Schraubenschaft zugewand- ten Enden der Rippen aufeinander zulaufen, so daß sich dort die Enden der Rippen sehr stark annähern würden, wenn nicht jede zweite Rippe gekürzt wäre. In diesen relativ großen Freiraum kann ein entsprechend großer Vorsprung des Prägewerkzeugs hineinragen, daß heißt, das Präge¬ werkzeug weist keine besonders schmalen Vorsprünge auf, die bei länge- rer Belastung zum Wegbrechen neigen. Die erfindungsgemäße Rippenge¬ staltung erleichtert aber nicht nur die eine hohe Standzeit gewährlei¬ stende Formgebung des Prägewerkzeugs, sie führt darüberbinaus dazu, daß sich in den Freiräumen Späne beim Eindrehen der Senkkopfschraube in ein Werkstück ansammeln können, die sonst abfließen müßten bzw. aufgrund ihres Volumens einen unerwünschten Druck auf das Material des Werkstücks ausüben könnten.Due to the shortening of the second rib in each case, a rib design results, in which a space is formed between two unshortened ribs and these are formed by the heel of the shortened rib and is relatively large in the area where the ends of the screw shaft facing the screw shaft Ribs converge so that the ends of the ribs would come very close together if not every other rib were shortened. A correspondingly large projection of the embossing tool can protrude into this relatively large free space, that is to say the embossing tool does not have any particularly narrow projections which tend to break away under prolonged loading. The rib design according to the invention not only facilitates the shaping of the embossing tool, which ensures a long service life, it also leads to the fact that chips can accumulate in the free spaces when the countersunk screw is screwed into a workpiece, which would otherwise have to flow or could exert an undesirable pressure on the material of the workpiece due to their volume.
Zweckmäßig wählt man die sich an den Absatz anschließende Länge der betreffenden Rippe so, daß diese Länge etwa 2/3 der Länge der benach¬ barten Rippen entspricht. Bei dieser Länge kann die gekürzte Rippe vor allen Dingen in ihrem äußeren Bereich voll an der Zerspanung des Materials des Werkstücks beim Eindrehen der Senkkopfschraube teil¬ nehmen und das in diesem Bereich zerspante Material mit den von innen her zugewanderten Spänen abtransportieren, während im radial inneren Bereich das dort zerspante Material weitgehend in den vorste¬ hend erwähnten Freiräumen verbleiben kann, so daß in diesem Bereich ein wesentlich geringeres Volumen an Spänen abzufordern ist.The length of the rib in question adjoining the shoulder is expediently chosen so that this length corresponds to approximately 2/3 of the length of the adjacent ribs. With this length, the shortened rib, above all, can fully participate in the machining of the material of the workpiece in its outer area when the countersunk screw is screwed in, and can remove the material machined in this area with the chips migrating from the inside, while in the radially inner area the material machined there can largely remain in the above-mentioned free spaces, so that a significantly smaller volume of chips has to be requested in this area.
Die hier behandelte Senkkopfschraube wird häufig dazu verwendet, eine das Werkstück bildende Platte an irgendeinem Träger anzuschrauben. Wenn dabei die Platte dicker ist als der Schraubenkopf der Senkkopf¬ schraube, dann ist es zweckmäßig, die ungekürzten Rippen soweit bis in den Bereich des Schraubenschaftes zu verlängern, daß sie sich bis in das Ende des Schraubenschaftes erstrecken, also auch im Bereich des Schrau¬ benschaftes eine Zerspanung des Materials im Sinne einer Erweiterung des Durchgangsloches für die Schraube schaffen. Wenn dagegen die Platte nur so dick oder dünner als der Schraubenkopf ist, dann genügt es, wenn die ungekürzten Rippen mit ihrem dem Schraubenkopf abge- wandten Ende in dessen konische Unterseite übergehen bzw. im Über¬ gang von Schraubenschaft und konischer Unterseite enden. In diesem Falle nimmmt der Schraubenkopf eine Zerspanung in dem Werkstück vor, die den gesamten Schraubenkopf aufnimmt, wobei das an den Schraubenkopf ansetzende Ende des Schraubenschaftes dann unmittelbar aus der Platte herausragt und in den Träger für die Platte übergeht. Für die Erstreckung der Rippen gibt es verschiedene Möglichkeiten. Zunächst kann man die Rippen radial verlaufen lassen. Ein geradlinig radialer Verlauf der Rippen erleichtert die Herstellung des Formwerk¬ zeugs für die Kaltverformung. Es ist aber auch möglich, bei Erhalt der Geradlinigkeit der Rippen, diese jeweils im wesentlichen parallel zu ihrer Mittellinie versetzt anzuordnen. Geschieht dies in Eindrehrichtung, lässt sich damit die Förderwirkung der Rippen auf die Späne verbessern.The countersunk screw discussed here is often used to screw a plate forming the workpiece to any support. If the plate is thicker than the screw head of the countersunk screw, then it is expedient to extend the uncut ribs to the area of the screw shaft so that they extend into the end of the screw shaft, that is to say also in the area of the screw shaft create a cutting of the material in the sense of widening the through hole for the screw. If, on the other hand, the plate is only as thick or thinner than the screw head, it is sufficient if the uncut ribs with their end facing away from the screw head merge into its conical underside or end in the transition from the screw shaft and conical underside. In this case, the screw head carries out machining in the workpiece, which takes up the entire screw head, the end of the screw shaft which is attached to the screw head then protruding directly from the plate and passing into the carrier for the plate. There are various options for extending the ribs. First you can let the ribs run radially. A straight, radial course of the ribs facilitates the production of the molding tool for cold forming. However, it is also possible, if the straightness of the ribs is maintained, to arrange them in each case essentially offset parallel to their center line. If this happens in the direction of rotation, the conveying effect of the ribs on the chips can be improved.
Einen ähnlichen Effekt erzielt man dann, wenn die Rippen in Eindreh- richtung eine konkave Schneide bilden. Abgesehen von einer gerundeten Ausführung kann man hierfür die Rippen auch aus zwei geradlinigen, über einen Knick aneinander anschließenden Teilen gestalten.A similar effect can be achieved if the ribs form a concave cutting edge in the direction of insertion. In addition to a rounded design, the ribs can also be made from two straight parts that are connected by a bend.
Insbesondere bei lockerem Material des betreffenden Werkzeugstücks kann es sinnvoll sein, die Späne bewußt nicht abzuführen, sondern zur Verdichtung des Materials im Bereich des Schraubenkopfes in das Mate¬ rial des Werkstücks einzupressen. Hierzu gibt man den Rippen in Ein¬ drehrichtung der Schraube eine konkave Form. Im Falle der Verwendung der oben erwähnten parallel versetzten Rippen können diese entgegen der Eindrehrichtung versetzt werden, so daß von den Rippen die Späne radial nach innen gefördert werden.In particular in the case of loose material of the tool piece in question, it may be sensible not to remove the chips, but rather to press them into the material of the workpiece in the area of the screw head in order to compress the material. For this purpose, the ribs are given a concave shape in the direction of screw rotation. If the above-mentioned parallel staggered ribs are used, they can be staggered against the direction of rotation, so that the shavings are conveyed radially inward from the ribs.
Je nach dem, ob es erwünscht ist unterhalb des Schraubenkopfes mehr oder weniger Material zu zerspanen, kann man die Außenflächen der Rippen entsprechend gestalten. Man kann diese geradlinig verlaufen lassen, wobei weniger Material zerspant wird als wenn man die Außen¬ flächen der Rippen gewölbt verlaufen läßt. In diesem Falle ergibt sich eine erhöhte Zerspanung. Wenn es erwünscht ist, dem Schraubenkopf eine gegenüber der betreffen¬ den Außenfläche des Werkstücks größere Absenkung zu geben, kann man den Schraubenkopf mit einem wesentlichen zylindrischen Rand versehen, der sich über die betreffenden Enden der Rippen fortsetzt. In diesem Falle wird von den Enden der Rippen ein zylindrischer Auslauf der konischen Senkung geschnitten, in die sich der Schraubenkopf absenken kann und damit gegebenenfalls mit seiner Außenfläche tiefer hegt als die Oberfläche des entsprechenden Werkstücks.Depending on whether it is desired to cut more or less material below the screw head, the outer surfaces of the ribs can be designed accordingly. These can be made to run in a straight line, less material being machined than if the outer surfaces of the ribs are to be curved. In this case there is increased machining. If it is desired to give the screw head a larger depression compared to the relevant outer surface of the workpiece, the screw head can be provided with a substantial cylindrical edge which continues over the relevant ends of the ribs. In this case, a cylindrical run-out of the conical countersink is cut from the ends of the ribs, into which the screw head can lower and thus possibly lie with its outer surface deeper than the surface of the corresponding workpiece.
In den Figuren sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigenExemplary embodiments of the invention are shown in the figures. Show it
Fig. 1 eine Senkkopfschraube in Seitensicht,1 is a countersunk head screw in side view,
Fig. 2 die gleiche Senkkopfschraube in einem Schnitt gemäß der Linie A-B aus Figur 1,2 shows the same countersunk screw in a section along the line A-B from FIG. 1,
Fig. 3 eine Seitenansicht einer Senkkopfschraube mit in die konische Unterseite des Schraubenkopfes übergehenden Enden der Rippen,3 is a side view of a countersunk screw with ends of the ribs merging into the conical underside of the screw head,
Fig. 4 eine Seitenansicht einer Senkkopfschraube mit sich bis in das Ende des Schraubenschaftes erstreckenden Rip¬ pen,4 shows a side view of a countersunk screw with ribs extending into the end of the screw shaft,
Fig. 5 eine Seitenansicht der Senkkopfschraube mit parallel zum Schraubenschaft verlängerten Rippen,5 is a side view of the countersunk screw with ribs elongated parallel to the screw shaft,
Fig. 6 einen Schnitt ähnlich demjenigen gemäß Figur 2 mit versetzten Rippen,6 shows a section similar to that according to FIG. 2 with offset ribs,
Fig. 7 einen Schnitt ähnlich demjenigen gemäß Figur 2 mit gebogenen Rippen,7 shows a section similar to that according to FIG. 2 with curved ribs,
Fig. 8 einen Schnitt ähnlich demjenigen gemäß Figur 2 mit abgeknickten Rippen. Figur 1 zeigt die Seitensicht einer Senkkopfschraube mit dem Schrauben¬ kopf 1, an den sich der Schraubenschaft 2 mit dem Gewinde 3 an¬ schließt. Der Schraubenkopf 1 weist eine konische Unterseite mit dem an den Schraubenschaft 2 anschließenden Konus 4 und dem darauffolgenden Konus 5 auf, welch letztere in den zylindrischen Rand 6 an der Obersei¬ te 7 des Schraubenkopfes übergeht. An der Unterseite des Schraubenkop¬ fes 1 sind mehrere Rippen 8 und 9 angebracht, und zwar wie aus der weiter unten erläuterten Figur 2 ersichtlich drei längere Rippen 8 und drei kürzere Rippen 9. Die Rippen 8 und 9 sind aus dem Material des Schraubenkopfes 1 durch Kaltverformung herausgeprägt. Die Rippen 8 erstrecken sich von dem Rand 6 bis zu der Kante 10, an der der Konus 4 an den Schraubenschaft 2 anstößt.Fig. 8 shows a section similar to that of Figure 2 with bent ribs. FIG. 1 shows the side view of a countersunk screw with the screw head 1, to which the screw shaft 2 with the thread 3 connects. The screw head 1 has a conical underside with the cone 4 adjoining the screw shaft 2 and the subsequent cone 5, the latter merging into the cylindrical edge 6 on the top side 7 of the screw head. On the underside of the screw head 1, a plurality of ribs 8 and 9 are attached, namely, as can be seen from FIG. 2 explained below, three longer ribs 8 and three shorter ribs 9. The ribs 8 and 9 are made of the material of the screw head 1 Cold stamped out. The ribs 8 extend from the edge 6 to the edge 10 at which the cone 4 abuts the screw shaft 2.
Die kürzeren Rippen 9 enden auf ihrer dem Schraubenschaft 2 zuge- wandten Seite in dem Absatz 11, durch den die Länge der Rippen 9 begrenzt ist. Aufgrund des Vorhandenseins dieses Absatzes 11 entsteht zwischen den beiden benachbarten Rippen 8 ein Freiraum 12 (siehe auch Figur 2), der sich günstig auf die Gestaltung des den Schraubenkopf 1 ausprägenden Formwerkzeuges auswirkt, da dieses das negative Bild der Unterseite des Schraubenkopfes 1 bildet. In diesem negativen Bild sind zur Ausformung der zwischen den Rippen 8 und 9 vorhandenen Zwi¬ schenräume Vorsprünge am Formwerkzeug vorzusehen, von denen jeweils die seitlich neben einer kürzeren Rippe 9 vorhandenen Vorsprünge des Formwerkzeugs über eine den Freiraum 12 ausfüllende Brücke im Form- Werkzeug verbunden sind. Das Formwerkzeug erhält hierdurch eine hohe Stabilität und damit auch eine entsprechend hohe Standzeit. Die Länge der kürzeren Rippen 9 entspricht etwa 2/3 der Länge der benachbarten längeren Rippen 8. Es sei noch darauf hingewiesen, daß, wie die Figur 1 zeigt, der Schraubenkopf 1 mit dem Schlitz 13 für einen Schrauben- dreher mit Klinge versehen ist. Anstelle des Schützes 13 kann natürhch auch irgend eine andere Werkzeugaufnahme verwendet werden, z.B. einen Kreuzschlitz.The shorter ribs 9 end on their side facing the screw shaft 2 in the shoulder 11, by which the length of the ribs 9 is limited. Due to the presence of this paragraph 11 there is a free space 12 between the two adjacent ribs 8 (see also FIG. 2), which has a favorable effect on the design of the shaping tool which shapes the screw head 1, since this forms the negative image of the underside of the screw head 1. In this negative image, projections are to be provided on the molding tool for forming the interstices between the ribs 8 and 9, of which the projections of the molding tool which are present laterally next to a shorter rib 9 are each connected via a bridge in the molding tool which fills the free space 12 . This gives the molding tool a high level of stability and therefore a correspondingly long service life. The length of the shorter ribs 9 corresponds to approximately 2/3 of the length of the adjacent longer ribs 8. It should also be pointed out that, as FIG. 1 shows, the screw head 1 is provided with the slot 13 for a screwdriver with a blade. Instead of the contactor 13 can naturally any other tool holder can also be used, for example a cross recess.
Figur 2 zeigt einen Schnitt gemäß der Linie A-B in Figur 1, sie zeigt somit die Unterseite des Schraubenkopfes 1 mit den symmetrisch an¬ geordneten kürzeren Rippen 9 und den längeren Rippen 8, die jeweils um den gleichen Winkel zueinander versetzt angeordnet sind. Die länge¬ ren Rippen 8 reichen dabei vom Rand 6 bis zur Kante 10, bei der der Konus 4 in den Schraubenschaft 2 übergeht. Die kürzeren Rippen 9 enden auf ihrer dem Schraubenschaft 2 zugewandten Seite in den Ab¬ sätzen 11, die hier, wie auch die Figur 1 zeigt, leicht abgeschrägt ver¬ laufen, um das Fließen des Materials des Schraubenkopfes 1 bei der Kaltumfoπnung zu erleichtern.Figure 2 shows a section along the line A-B in Figure 1, it thus shows the underside of the screw head 1 with the symmetrically arranged shorter ribs 9 and the longer ribs 8, which are each offset by the same angle to each other. The longer ribs 8 extend from the edge 6 to the edge 10 at which the cone 4 merges into the screw shaft 2. The shorter ribs 9 end on their side facing the screw shank 2 in the shoulders 11, which here, as also shown in FIG. 1, run slightly chamfered in order to facilitate the flow of the material of the screw head 1 during cold forming.
Beim Eindrehen der in den Figuren 1 und 2 dargestellten Senkkopf¬ schraube gemäß der in Figur 2 eingezeichneten Pfeilrichtung schneiden die vorderen Senkschneiden 14 der Rippen 8 und 9 Material aus dem Werkstück heraus, wie dies sonst mittels eines Senkers erforderüch ist. Der Schraubenkopf 1 übernimmt damit also die Rolle eines Senkers. Die von den Senkschneiden 14 aus dem Material des betreffenden Werk¬ stücks herausgeschnittenen Späne können sowohl in radialer Richtung neben den Rippen 8 und 9 abfließen, sie können sich aber auch in den Freiräumen 12 vor den Absätzen 11 aufstauen, wobei sie den hier vorhandenen Freiraum 12 ausnützen.When the countersunk head screw shown in FIGS. 1 and 2 is screwed in according to the direction of the arrow shown in FIG. 2, the front countersinking edges 14 of the ribs 8 and 9 cut material out of the workpiece, as is otherwise required by means of a countersink. The screw head 1 thus takes on the role of a countersink. The chips cut out from the material of the workpiece in question by the countersink blades 14 can flow off in the radial direction next to the ribs 8 and 9, but they can also accumulate in the free spaces 12 in front of the shoulders 11, whereby they clear the free space 12 present here take advantage of.
Figur 3 zeigt die Seitensicht einer Senkkopfschraube mit einem Schrau¬ benkopf 1, dessen ungekürzte Rippen 15 an ihrem dem Schraubenschaft 2 zugewandten Ende in die Unterseite des Schraubenkopfes 1 übergehen, der hier durch den einzigen Konus 17 gebildet ist. Es handelt sich also um eine Ausführungsform, bei der mit dem Eindrehen der Senkkopf- - 8 -FIG. 3 shows the side view of a countersunk screw with a screw head 1, the unabridged ribs 15 of which at its end facing the screw shaft 2 merge into the underside of the screw head 1, which is formed here by the single cone 17. It is therefore an embodiment in which the countersunk - 8th -
schraube der Schraubenkopf mit den Senkschneiden 18 erst dann mit dem betreffenden Werkstück in Kontakt tritt, wenn sich der Konus 17 ein kurzes Stück in das Material des betreffenden Werkstücks einge¬ drückt hat. Dies ist dann von Vorteil, wenn man das betreffende Werk- stück in das der Schraubenkopf zu versenken ist, aus einer relativ dün¬ nen Platte besteht.screw the screw head with the countersunk cutting edges 18 does not come into contact with the workpiece in question until the cone 17 has pressed a short distance into the material of the workpiece in question. This is advantageous if the workpiece in question in which the screw head is to be countersunk consists of a relatively thin plate.
In Figur 4 ist eine weitere Ausführungsform einer Senkkopfschraube in Seitensicht dargestellt, bei der die Außenflächen mit ihren Senkschneiden 21 der Rippen 19 und 20 nach außen gewölbt verlaufen. Hierdurch wird etwas mehr Material aus dem betreffenden Werkstück herausgeschnitten, als ansich für eine Senkung notwendig ist, was dann von Vorteil ist, wenn der Schraubenkopf 1 bis unter die Oberfläche des betreffenden Werkstücks etwas abgesenkt werden soll. Die ungekürzten Rippen 20 verlaufen hier von dem Rand 6 bis in den Bereich des Schraubenschaftes 2 hinein, wobei ihr betreffendes Ende 22 ein kurzes Stück über dem Schraubenschaft 2 verläuft.FIG. 4 shows a further embodiment of a countersunk screw in a side view, in which the outer surfaces with their countersunk cutting edges 21 of the ribs 19 and 20 are curved outwards. As a result, a little more material is cut out of the workpiece in question than is actually necessary for a countersink, which is advantageous if the screw head 1 is to be lowered somewhat below the surface of the workpiece in question. The uncut ribs 20 here extend from the edge 6 into the area of the screw shaft 2, their end 22 in question running a short distance above the screw shaft 2.
In Figur 5 ist eine Abwandlung der Gestaltung gemäß Figur 4 darge- stellt, bei der das den Schraubenschaft 2 überdeckende Ende 23 parallel zum Schraubenschaft 2 verläuft, das heißt im Bereich des Endes 23 wird aus dem Material des betreffenden Werkstücks eine zylindrische Bohrung herausgeschnitten, deren Durchmesser etwa dem Durchmesser des Gewin¬ des 3 entspricht, so daß sich damit in dem betreffenden Werkstück ein Durchgangsloch für das Gewinde 3 ergibt. Der zylindrische Rand 6 des Schraubenkopfes 1 ist hier gleichzeitig die Begrenzung 24 für die betref¬ fenden Enden der Rippen 8 und 9. Diese Enden hegen mit ihren Begrenzungen 24 in einer zylindrischen UmhüUenden, die mit dem den Rand 6 bildenenden Zylinder übereinstimmt. Aufgrund dieser Gestaltung der Rippen 8 und 9 wird eine entsprechende 2ylindrische Ausnehmung beim Eindrehen des Schraubenkopfes in ein Werkstück eingeschnitten, in die sich der Schraubenkopf absenkt, womit dessen Oberseite 7 gegenüber der Oberfläche des betreffenden Werkstücks entsprechend abgesenkt wird.FIG. 5 shows a modification of the design according to FIG. 4, in which the end 23 covering the screw shank 2 runs parallel to the screw shank 2, that is to say in the region of the end 23 a cylindrical bore is cut out of the material of the workpiece in question Diameter corresponds approximately to the diameter of the thread 3, so that there is a through hole for the thread 3 in the workpiece in question. The cylindrical edge 6 of the screw head 1 is at the same time the boundary 24 for the relevant ends of the ribs 8 and 9. These ends, with their boundaries 24, lie in a cylindrical envelope which corresponds to the cylinder forming the edge 6. Due to this design of the ribs 8 and 9, a corresponding 2-cylindrical recess cut into a workpiece when the screw head is screwed, into which the screw head lowers, with the upper side 7 thereof being correspondingly lowered relative to the surface of the workpiece in question.
In Figur 6 ist ein Schraubenkopf 1 ähnliche Darstellung gemäß Figur 2 gezeigt, bei dem unverkürzte Rippen 25 und verkürzte Rippen 26 jeweils im wesentlichen parallel zu einer vertikalen Mittellinie 29 versetzt ver¬ laufen. Aufgrund dieser Anordnung der Rippen 25 und 26 ergibt sich bei Eindrehen des Schraubenkopfes 1 in ein Werkstück in der eingezeichne- ten Pfeilrichtung die Tendenz für die zwischen den Rippen fließenden Späne, daß diese nach außen gefördert werden.FIG. 6 shows a screw head 1 similar to that shown in FIG. 2, in which uncut ribs 25 and shortened ribs 26 are each offset essentially parallel to a vertical center line 29. Because of this arrangement of the ribs 25 and 26, when the screw head 1 is screwed into a workpiece in the direction of the arrow shown, the tendency for the chips flowing between the ribs is that they are conveyed to the outside.
Eine ähnüche Gestaltung ist in Figur 7 dargestellt, bei der die Rippen 27 und 28 mit ihren Senkschneiden 30 unter Zugrundelegung der durch die Pfeilrichtung angedeutete Eindrehrichtung konvex verlaufen und damit zwischen den Rippen 27 und 28 üegenden Spänen die Tendenz geben, nach außen wegzugleiten.A similar design is shown in FIG. 7, in which the ribs 27 and 28 with their countersink blades 30 are convex on the basis of the direction of rotation indicated by the direction of the arrow and thus give chips between the ribs 27 and 28 the tendency to slide away to the outside.
Figur 8 zeigt eine Abwandlung gegenüber der Gestaltung gemäß Figur 7, bei der die Rippen 27 und 28 mit einem Knick versehen sind, was für die Erstellung des betreffenden Formwerkzeugs von Vorteil ist.Figure 8 shows a modification to the design according to Figure 7, in which the ribs 27 and 28 are provided with a kink, which is advantageous for the creation of the mold in question.
Es sei noch darauf hingewiesen, daß die Rippen 27 und 28 gemäß den Figuren 7 und 8 konkav gestaltet werden können, womit sich der Effekt ergibt, daß sich das von ihnen herausgeschnittene Spanmaterial nach innen zu verdichtet, also nicht nach außen gefördert wird, was für ver¬ schiedene Anwendungsfälle, insbesondere bei lockerem Material des Werkstücks, von Vorteil sein kann. It should also be pointed out that the ribs 27 and 28 can be made concave according to FIGS. 7 and 8, which has the effect that the chip material cut out by them is compressed inwards, that is to say is not conveyed outwards, which is the case Various applications, particularly when the workpiece material is loose, can be advantageous.

Claims

Ansprüche Expectations
1. Senkkopfschraube mit an der konischen Unterseite ihres Schrauben¬ kopfes (1) angeordneten, gegenüber der Unterseite vorspringenden, in gerader Anzahl vorhandenen Rippen (8,9; 15,16; 19,20; 25,26;1. Countersunk screw with an even number of ribs arranged on the conical underside of its screw head (1) and projecting towards the underside (8.9; 15.16; 19.20; 25.26;
27,28)mit Senkschneiden (14,18,21,30), dadurch gekennzeichnet, daß jede zweite Rippe (9,16,20,26,28) an ihrem dem Schraubenschaft (2) zugewandten Ende einen Absatz (11) aufweist, der durch Kürzung der betreffenden Rippe (9,16,20,26,28) gegenüber den benachbarten Rippen (8,15,19,25,27) gebildet ist.27, 28) with countersunk cutting edges (14, 18, 21, 30), characterized in that every second rib (9, 16, 20, 26, 28) has a shoulder (11) at its end facing the screw shaft (2), which is formed by shortening the rib in question (9,16,20,26,28) compared to the neighboring ribs (8,15,19,25,27).
2. Senkkopfschraube nach Anspruch 1, dadurch gekennzeichnet, daß sich an den Absatz (11) eine Länge der betreffenden Rippe (9) an¬ schließt, die etwa 2/3 der Länge der benachbarten Rippen (8) ent- spricht.2. Countersunk screw according to claim 1, characterized in that the paragraph (11) is followed by a length of the rib (9) in question, which corresponds to approximately 2/3 of the length of the adjacent ribs (8).
3. Senkkopfschraube nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die ungekürzten Rippen (19) bis in den Bereich des Schrauben¬ schaftes (2) verlängert sind.3. countersunk head screw according to claim 1 or 2, characterized in that the uncut ribs (19) are extended into the region of the screw shaft (2).
4. Senkkopfschraube nach Anspruch 3, dadurch gekennzeichnet, daß die ungekürzten Rippen (15) mit ihrem dem Schraubenkopf (2) abge¬ wandten Ende in dessen konische Unterseite (17) übergehen.4. countersunk head screw according to claim 3, characterized in that the uncut ribs (15) with their screw head (2) abge¬ end in the conical bottom (17) pass.
5. Senkkopfschraube nach Anspruch 3, dadurch gekennzeichnet, daß die ungekürzten Rippen (8) mit ihrem dem Schraubenkopf (1) abge- wandten Ende im Übergang von Schraubenschaft (2) und konischer Unterseite (4) enden.5. countersunk screw according to claim 3, characterized in that the uncut ribs (8) with their the screw head (1) end in the transition from the screw shaft (2) and the conical underside (4).
6. Senkkopfschraube nach Anspruch 3, dadurch gekennzeichnet, daß die Rippen (19) sich bis in das Ende des Schraubenschaftes (2) erstrek- ken.6. Countersunk screw according to claim 3, characterized in that the ribs (19) extend into the end of the screw shaft (2).
7. Senkkopfschraube nach Anspruch 6, dadurch gekennzeichnet, daß die Rippen (8) im Bereich ihrer Erstreckung am Ende des Schrauben- Schaftes (2) parallel zum Schraubenschaft (2) verlaufen.7. Countersunk screw according to claim 6, characterized in that the ribs (8) in the region of their extension at the end of the screw shaft (2) run parallel to the screw shaft (2).
8. Senkkopfschraube nach einem der Ansprüche 1 bis 7, dadurch ge¬ kennzeichnet, daß die Rippen (8,9) radial verlaufen.8. countersunk screw according to one of claims 1 to 7, characterized ge indicates that the ribs (8,9) extend radially.
9. Senkkopfschraube nach einem der Ansprüche 1 bis 7, dadurch ge¬ kennzeichnet, daß die Rippen (25,26) jeweils im wesentlichen parallel zu einer vertikalen Mittellinie (29) versetzt verlaufen.9. countersunk screw according to one of claims 1 to 7, characterized ge indicates that the ribs (25,26) each offset substantially parallel to a vertical center line (29).
10. Senkkopfschraube nach einem der Ansprüche 1 bis 7, dadurch ge- kennzeichnet, daß die Rippen (27,28) in Eindrehrichtung der Schrau¬ be eine konkave oder konvexe Senkschneide (30) bilden.10. Countersunk screw according to one of claims 1 to 7, characterized in that the ribs (27, 28) form a concave or convex countersunk cutting edge (30) in the screwing-in direction of the screw.
11. Senkkopfschraube nach Anspruch 10, dadurch gekennzeichnet, daß die Rippen (27,28) aus zwei geradlinigen, über einen Knick anschüe- ßenden Teilen bestehen.11. Countersunk screw according to claim 10, characterized in that the ribs (27, 28) consist of two rectilinear parts which are connected by a kink.
12. Senkkopfschraube nach einen der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Außenflächen der Rippen (8,9; 15,16) gerad¬ linig verlaufen. 12. Countersunk screw according to one of claims 1 to 11, characterized in that the outer surfaces of the ribs (8,9; 15,16) run straight.
13. Senkkopfschraube nach einen der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß die Außenflächen der Rippen (19,20) nach außen gewölbt verlaufen.13. Countersunk screw according to one of claims 1 to 11, characterized in that the outer surfaces of the ribs (19, 20) are curved outwards.
14. Senkkopfschraube nach einem der Ansprüche 1-13, dadurch gekenn¬ zeichnet, daß der Schraubenkopf (1) einen im wesentlichen zylin¬ drischen Rand (24) aufweist, der sich über die betreffenden Enden der Rippen (8,9) fortsetzt. 14. Countersunk screw according to one of claims 1-13, characterized gekenn¬ characterized in that the screw head (1) has a substantially cylin¬ drical edge (24) which continues over the relevant ends of the ribs (8,9).
EP96917402A 1995-05-29 1996-05-22 Countersunk head screw Expired - Lifetime EP0781382B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29508852U DE29508852U1 (en) 1995-05-29 1995-05-29 Countersunk screw
DE29508852U 1995-05-29
PCT/EP1996/002203 WO1996038676A1 (en) 1995-05-29 1996-05-22 Countersunk head screw

Publications (2)

Publication Number Publication Date
EP0781382A1 true EP0781382A1 (en) 1997-07-02
EP0781382B1 EP0781382B1 (en) 1998-11-25

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US (1) US5772376A (en)
EP (1) EP0781382B1 (en)
JP (1) JPH10503577A (en)
AU (1) AU5999396A (en)
DE (2) DE29508852U1 (en)
DK (1) DK0781382T3 (en)
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WO (1) WO1996038676A1 (en)

Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29903231U1 (en) * 1999-02-23 2000-07-06 Az Ausruest Zubehoer Gmbh Countersunk screw
DE29903232U1 (en) * 1999-02-23 2000-07-06 Az Ausruest Zubehoer Gmbh Countersunk screw
DE29906200U1 (en) * 1999-04-07 2000-09-07 Az Ausruest Zubehoer Gmbh Countersunk screw
AUPQ727500A0 (en) 2000-05-03 2000-05-25 Itw Australia Pty Ltd A screw fastener
AU782454B2 (en) * 2000-05-03 2005-07-28 Illinois Tool Works Inc. A screw fastener
JP2002323027A (en) * 2001-02-21 2002-11-08 Tanaka:Kk Screw bolt for timber, cramp and fixator using screw bolt for timber
US6676353B1 (en) * 2002-07-15 2004-01-13 Harry M. Haytayan Self-drilling, self-tapping screws
US7591623B2 (en) * 2002-08-30 2009-09-22 Whitesell International Corporation Heavy metal pierce nut
US7112024B2 (en) * 2002-08-30 2006-09-26 Whitesell International Corporation Self-attaching nut
DE10243791A1 (en) * 2002-09-17 2004-03-18 Schäfer, Bernd Cervical vertebral plate for osteosynthesis has cup-shaped openings in corners of plate for heads of bone screws, with decreasing depth towards distal end
US20050013680A1 (en) * 2003-07-18 2005-01-20 Steve Karaga Screws and methods of driving a screw into a workpiece
DE20313819U1 (en) * 2003-09-05 2005-01-13 A-Z Ausrüstung Und Zubehör Gmbh & Co. Kg countersunk
US7293947B2 (en) * 2004-04-09 2007-11-13 Phillips Screw Company Screw having a knurled portion
DE102004020952A1 (en) * 2004-04-28 2005-11-24 Deutsche Thomson-Brandt Gmbh Optical scanning device for different devices for recording or reproducing data or information with an optical record carrier
DE102004021484B4 (en) * 2004-04-30 2018-11-29 Böllhoff Verbindungstechnik GmbH Method for producing a connection arrangement
CA2476046C (en) * 2004-07-23 2012-07-10 Bruce Mead Grounding method and grid for a pedestal supported access floor
US7766948B1 (en) * 2005-05-05 2010-08-03 Ebi, Llc Bone fixation assembly
DE102006002559A1 (en) * 2006-01-10 2007-07-12 Swg Schraubenwerk Gaisbach Gmbh countersunk
TWM296931U (en) * 2006-03-24 2006-09-01 Chiou-Yue Wang Screw
US20070237606A1 (en) * 2006-04-11 2007-10-11 Seiichirou Takasaki Screw for composite building materials
US20080124187A1 (en) * 2006-11-08 2008-05-29 Haytayan Harry M Self-drilling, self-tapping screw fasteners
DE102007005677B4 (en) 2007-02-05 2008-11-06 Ludwig Hettich & Co. Head of a countersunk screw
SE532288C2 (en) * 2008-03-12 2009-12-01 Jeld Wen Sverige Ab Cover for a frame screw and frame screws which include housing
JP2010071401A (en) * 2008-09-19 2010-04-02 Pias Hanbai Kk Clinch bolt
CA2647663C (en) * 2008-12-19 2013-08-20 Mirco Walther Self-counter-sinking screw with circumferential cutters
GB2470404B (en) 2009-05-22 2014-03-19 Phillips Screw Co Low energy screws for wood and similar materials
AU2009230753C1 (en) * 2009-09-30 2015-11-26 Craig Stanley Harvey Self-countersinking fastener
DE102010030408A1 (en) 2010-06-23 2011-12-29 Hilti Aktiengesellschaft Screw and method for identifying the screw
US20130022426A1 (en) * 2011-07-19 2013-01-24 Yih Shwei Bolt Industrial Co., Ltd. Screw
US9482258B2 (en) * 2012-05-10 2016-11-01 Simpson Strong-Tie Company, Inc. Fastener with multiple threaded regions
US9400005B2 (en) * 2012-06-29 2016-07-26 Infastech Intellectual Property Pte. Ltd Self-clinching fastener
WO2014058939A1 (en) * 2012-10-09 2014-04-17 Handy & Harman Wood decking screw
US20140178150A1 (en) * 2012-12-26 2014-06-26 Taiwan Shan Yin International Co., Ltd. Wood screw
US8858145B2 (en) * 2012-12-26 2014-10-14 Taiwan Shan Yin International Co., Ltd. Fastener capable of speedily screwing
US9651079B2 (en) 2013-03-21 2017-05-16 Simpson Strong-Tie Company, Inc. Fastener with prolate cross-section
US9523383B2 (en) 2013-03-26 2016-12-20 Simpson Strong-Tie Company, Inc. Variable thread fastener
US20150063947A1 (en) * 2013-08-29 2015-03-05 Shu-Chin Huang Screw capable of easily drilling holes and dregs removing
US10626909B2 (en) * 2013-08-29 2020-04-21 Shu-Chin Huang Countersinking screw capable of easily drilling holes and dregs removing
KR200477278Y1 (en) * 2013-11-28 2015-05-26 새한전자(주) Screw for coupling wooden members together
CN104533917A (en) * 2014-11-17 2015-04-22 常州市金海基机械制造有限公司 A high-strength screw
TW201632744A (en) * 2015-03-11 2016-09-16 寬仕工業股份有限公司 Screw for avoiding splits and burrs
DE102016223607A1 (en) * 2016-11-29 2018-05-30 Robert Bosch Gmbh screw
DE202016007445U1 (en) * 2016-11-30 2018-03-02 Arnold Umformtechnik Gmbh & Co. Kg screw
DE202017004671U1 (en) * 2017-09-07 2018-12-10 Dieter Ramsauer Grounding screw with segmental cutting edge
EP3581319B1 (en) 2018-05-09 2023-12-13 Brigham Young University System and method for friction bit joining
BE1026277B1 (en) 2018-05-14 2019-12-17 Pgb Int Nv RENEWED FLAT SCREW
CN110792670A (en) * 2018-08-03 2020-02-14 庆达科技股份有限公司 Locking part
EP3550160B1 (en) * 2018-08-20 2021-03-24 Taiwan Shan Yin International Co., Ltd. Fastener
US11293475B2 (en) * 2020-01-17 2022-04-05 Kuo-Tai Hsu Screw
US11835077B2 (en) 2021-08-11 2023-12-05 Taiwan Shan Yin International Co., Ltd. Screw

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1151861A (en) * 1914-05-23 1915-08-31 Ernest M Brumback Countersinking screw-head.
GB113183A (en) * 1917-04-10 1918-02-14 Henry Collins Improvements in Wood Screws.
US3370631A (en) * 1965-05-17 1968-02-27 Diamond Expansion Bolt Co Inc Wood fastener
DE3334212A1 (en) * 1983-09-22 1985-04-04 Adolf Würth GmbH & Co KG, 7118 Künzelsau Countersunk screw
DE3346704A1 (en) * 1983-12-23 1985-07-04 Richter-System GmbH & Co KG, 6103 Griesheim SELF-TAPING QUICK-SCREW SCREW
JPH0289805A (en) * 1988-09-24 1990-03-29 Araco Corp Screw for board
GB8901659D0 (en) * 1989-01-27 1989-03-15 Quarmby David I Improvements in or relating to screw fasteners
US5199839A (en) * 1991-10-09 1993-04-06 Abbott-Interfast Corporation Fastener screw having improved installation and self-locking characteristics

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9638676A1 *

Also Published As

Publication number Publication date
US5772376A (en) 1998-06-30
AU5999396A (en) 1996-12-18
DK0781382T3 (en) 1999-08-09
EP0781382B1 (en) 1998-11-25
WO1996038676A1 (en) 1996-12-05
JPH10503577A (en) 1998-03-31
DE29508852U1 (en) 1996-09-26
DE59600865D1 (en) 1999-01-07
PL318350A1 (en) 1997-06-09

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